Definitions:
a thickness or layer of a folded or laminated material

(in game theory) the number of levels at which branching occurs in a tree of possible outcomes, typically corresponding to the number of moves ahead (in chess strictly half-moves ahead) considered by a computer program.

work steadily with (a tool)

(of a vessel or vehicle) travel regularly over a route, typically for commercial purposes

provide someone with (food or drink) in a continuous or insistent way